# CVE-2026-20172

## Summary

- **CVE ID:** CVE-2026-20172
- **Severity:** MEDIUM
- **CVSS Score:** 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
- **CWE:** CWE-646
- **Published:** May 6, 2026
- **Last Modified:** May 6, 2026

## Description

A vulnerability in the Lite Agent feature of Cisco Enterprise Chat and Email (ECE) could allow an authenticated, remote attacker to conduct browser-based attacks. To exploit this vulnerability, the attacker must have valid credentials for a user account with at least the role of Agent.

This vulnerability is due to inadequate validation of file contents during file upload operations. An attacker could exploit this vulnerability by uploading a file that contains malicious scripts or HTML code, which the application could make available to other users to access. A successful exploit could allow the attacker to execute the contents of that file in the browser of a user and conduct browser-based attacks. 

## Affected Products

- Cisco — Cisco Enterprise Chat and Email (11.6(1)_ES3)
- Cisco — Cisco Enterprise Chat and Email (11.6(1)_ES4)
- Cisco — Cisco Enterprise Chat and Email (12.0(1)_ES6)
- Cisco — Cisco Enterprise Chat and Email (11.6(1)_ES8)
- Cisco — Cisco Enterprise Chat and Email (12.0(1)_ES5a)
- Cisco — Cisco Enterprise Chat and Email (11.6(1)_ES9)
- Cisco — Cisco Enterprise Chat and Email (12.0(1)_ES6_ET1)
- Cisco — Cisco Enterprise Chat and Email (11.6(1)_ES6)
- Cisco — Cisco Enterprise Chat and Email (11.6(1)_ES5)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.5(1))
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES3_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.0(1)_ES3)
- Cisco — Cisco Enterprise Chat and Email (11.6(1)_ES11)
- Cisco — Cisco Enterprise Chat and Email (12.0(1)_ES4)
- Cisco — Cisco Enterprise Chat and Email (12.0(1)_ES5)
- Cisco — Cisco Enterprise Chat and Email (11.6(1)_ES2)
- Cisco — Cisco Enterprise Chat and Email (11.6(1)_ES9a)
- Cisco — Cisco Enterprise Chat and Email (11.6(1)_ES10)
- Cisco — Cisco Enterprise Chat and Email (12.0(1)_ES1)
- Cisco — Cisco Enterprise Chat and Email (12.0(1))
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES3)
- Cisco — Cisco Enterprise Chat and Email (12.6(1))
- Cisco — Cisco Enterprise Chat and Email (11.5(1))
- Cisco — Cisco Enterprise Chat and Email (12.0(1)_ES2)
- Cisco — Cisco Enterprise Chat and Email (11.6(1)_ES7)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES2)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ET1)
- Cisco — Cisco Enterprise Chat and Email (11.6(1))
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES1)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ET2)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES3_ET2)
- Cisco — Cisco Enterprise Chat and Email (12.0(1)_ES6_ET2)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES1)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES4)
- Cisco — Cisco Enterprise Chat and Email (11.6(1)_ES12)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ET3)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES4_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.0(1)_ES6_ET3)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES1_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES2)
- Cisco — Cisco Enterprise Chat and Email (12.6_ES2_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES5)
- Cisco — Cisco Enterprise Chat and Email (12.6_ES2_ET2)
- Cisco — Cisco Enterprise Chat and Email (12.0(1)_ES7)
- Cisco — Cisco Enterprise Chat and Email (12.6_ES2_ET3)
- Cisco — Cisco Enterprise Chat and Email (12.0(1)_ES7_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES5_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.6_ES2_ET4)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES3)
- Cisco — Cisco Enterprise Chat and Email (11.6(1)_ES12_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.6_ES3_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES6)
- Cisco — Cisco Enterprise Chat and Email (12.6_ES3_ET2)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES4)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES7)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES4_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES5)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES5_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES5_ET2)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES6)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES6_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES8)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES6_ET2)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES7)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES8)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES4_ET2)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES3_ET3)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES2_ET5)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES1_ET2)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES8_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES7_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES6_ET3)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES5_ET3)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES8_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES3_ET3)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES5_ET2)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES6_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES4_ET2)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES7_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES8_ET2)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES9)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES9_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES9)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES9_ET2)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES9_ET3)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES10)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES10_ET1)
- Cisco — Cisco Enterprise Chat and Email (15.0(1))
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES11)
- Cisco — Cisco Enterprise Chat and Email (15.0(1)_ET1)
- Cisco — Cisco Enterprise Chat and Email (15.0(1)ES202508)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES11_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES11_ET2)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES12)
- Cisco — Cisco Enterprise Chat and Email (15.0(1)ES202511)
- Cisco — Cisco Enterprise Chat and Email (12.6(1)_ES12_ET1)
- Cisco — Cisco Enterprise Chat and Email (15.0(1)ES202511_ET1)
- Cisco — Cisco Enterprise Chat and Email (12.5(1)_ES10)

## References

- [CNA](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ece-lite-agent-BCgSN8eb)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.13%
- **EPSS Percentile:** 2.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._